mcs/class/Managed.Windows.Forms/System.Windows.Forms.Layout/DefaultLayout.cs

   1 //
   2 // DefaultLayout.cs
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 // Copyright (c) 2006 Jonathan Pobst
  24 //
  25 // Authors:
  26 //      Jonathan Pobst (monkey@jpobst.com)
  27 //      Stefan Noack (noackstefan@googlemail.com)
  28 //
  29
  30 using System;
  31 using System.Drawing;
  32
  33 namespace System.Windows.Forms.Layout
  34 {
  35         class DefaultLayout : LayoutEngine
  36         {
  37                 void LayoutDockedChildren (Control parent, Control[] controls)
  38                 {
  39                         Rectangle space = parent.DisplayRectangle;
  40                         MdiClient mdi = null;
  41
  42 #if NET_2_0
  43                         space.X += parent.Padding.Left;
  44                         space.Y += parent.Padding.Top;
  45                         space.Width -= parent.Padding.Horizontal;
  46                         space.Height -= parent.Padding.Vertical;
  47 #endif
  48
  49                         // Deal with docking; go through in reverse, MS docs say that lowest Z-order is closest to edge
  50                         for (int i = controls.Length - 1; i >= 0; i--) {
  51                                 Control child = controls[i];
  52                                 Size child_size = child.Size;
  53
  54 #if NET_2_0
  55                                 if (child.AutoSize)
  56                                         child_size = GetPreferredControlSize (child);
  57 #endif
  58
  59                                 if (!child.VisibleInternal
  60                                     || child.ControlLayoutType == Control.LayoutType.Anchor)
  61                                         continue;
  62
  63                                 // MdiClient never fills the whole area like other controls, have to do it later
  64                                 if (child is MdiClient) {
  65                                         mdi = (MdiClient)child;
  66                                         continue;
  67                                 }
  68
  69                                 switch (child.Dock) {
  70                                 case DockStyle.None:
  71                                         // Do nothing
  72                                         break;
  73
  74                                 case DockStyle.Left:
  75                                         child.SetBounds (space.Left, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
  76                                         space.X += child.Width;
  77                                         space.Width -= child.Width;
  78                                         break;
  79
  80                                 case DockStyle.Top:
  81                                         child.SetBounds (space.Left, space.Y, space.Width, child_size.Height, BoundsSpecified.None);
  82                                         space.Y += child.Height;
  83                                         space.Height -= child.Height;
  84                                         break;
  85
  86                                 case DockStyle.Right:
  87                                         child.SetBounds (space.Right - child_size.Width, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
  88                                         space.Width -= child.Width;
  89                                         break;
  90
  91                                 case DockStyle.Bottom:
  92                                         child.SetBounds (space.Left, space.Bottom - child_size.Height, space.Width, child_size.Height, BoundsSpecified.None);
  93                                         space.Height -= child.Height;
  94                                         break;
  95
  96                                 case DockStyle.Fill:
  97                                         child.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
  98                                         break;
  99                                 }
 100                         }
 101
 102                         // MdiClient gets whatever space is left
 103                         if (mdi != null)
 104                                 mdi.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
 105                 }
 106
 107                 void LayoutAnchoredChildren (Control parent, Control[] controls)
 108                 {
 109                         Rectangle space = parent.ClientRectangle;
 110
 111                         for (int i = 0; i < controls.Length; i++) {
 112                                 int left;
 113                                 int top;
 114                                 int width;
 115                                 int height;
 116
 117                                 Control child = controls[i];
 118
 119                                 if (!child.VisibleInternal
 120                                     || child.ControlLayoutType == Control.LayoutType.Dock)
 121                                         continue;
 122
 123                                 AnchorStyles anchor = child.Anchor;
 124
 125                                 left = child.Left;
 126                                 top = child.Top;
 127
 128                                 width = child.Width;
 129                                 height = child.Height;
 130
 131                                 if ((anchor & AnchorStyles.Right) != 0) {
 132                                         if ((anchor & AnchorStyles.Left) != 0)
 133                                                 width = space.Width - child.dist_right - left;
 134                                         else
 135                                                 left = space.Width - child.dist_right - width;
 136                                 }
 137                                 else if ((anchor & AnchorStyles.Left) == 0) {
 138                                         // left+=diff_width/2 will introduce rounding errors (diff_width removed from svn after r51780)
 139                                         // This calculates from scratch every time:
 140                                         left = left + (space.Width - (left + width + child.dist_right)) / 2;
 141                                         child.dist_right = space.Width - (left + height);
 142                                 }
 143
 144                                 if ((anchor & AnchorStyles.Bottom) != 0) {
 145                                         if ((anchor & AnchorStyles.Top) != 0)
 146                                                 height = space.Height - child.dist_bottom - top;
 147                                         else
 148                                                 top = space.Height - child.dist_bottom - height;
 149                                 }
 150                                 else if ((anchor & AnchorStyles.Top) == 0) {
 151                                         // top += diff_height/2 will introduce rounding errors (diff_height removed from after r51780)
 152                                         // This calculates from scratch every time:
 153                                         top = top + (space.Height - (top + height + child.dist_bottom)) / 2;
 154                                         child.dist_bottom = space.Height - (top + height);
 155                                 }
 156
 157                                 // Sanity
 158                                 if (width < 0)
 159                                         width = 0;
 160
 161                                 if (height < 0)
 162                                         height = 0;
 163
 164                                 child.SetBounds (left, top, width, height, BoundsSpecified.None);
 165                         }
 166                 }
 167
 168 #if NET_2_0
 169                 void LayoutAutoSizedChildren (Control parent, Control[] controls)
 170                 {
 171                         for (int i = 0; i < controls.Length; i++) {
 172                                 int left;
 173                                 int top;
 174
 175                                 Control child = controls[i];
 176                                 if (!child.VisibleInternal
 177                                     || child.ControlLayoutType == Control.LayoutType.Dock
 178                                     || !child.AutoSize)
 179                                         continue;
 180
 181                                 left = child.Left;
 182                                 top = child.Top;
 183
 184                                 Size preferredsize = GetPreferredControlSize (child);
 185
 186                                 child.SetBounds (left, top, preferredsize.Width, preferredsize.Height, BoundsSpecified.None);
 187                         }
 188                 }
 189
 190                 void LayoutAutoSizeContainer (Control container)
 191                 {
 192                         int left;
 193                         int top;
 194                         int width;
 195                         int height;
 196
 197                         if (!container.VisibleInternal || container.ControlLayoutType == Control.LayoutType.Dock || !container.AutoSize)
 198                                 return;
 199
 200                         left = container.Left;
 201                         top = container.Top;
 202
 203                         Size preferredsize = container.PreferredSize;
 204
 205                         if (container.GetAutoSizeMode () == AutoSizeMode.GrowAndShrink) {
 206                                 width = preferredsize.Width;
 207                                 height = preferredsize.Height;
 208                         } else {
 209                                 width = container.ExplicitBounds.Width;
 210                                 height = container.ExplicitBounds.Height;
 211                                 if (preferredsize.Width > width)
 212                                         width = preferredsize.Width;
 213                                 if (preferredsize.Height > height)
 214                                         height = preferredsize.Height;
 215                         }
 216
 217                         // Sanity
 218                         if (width < container.MinimumSize.Width)
 219                                 width = container.MinimumSize.Width;
 220
 221                         if (height < container.MinimumSize.Height)
 222                                 height = container.MinimumSize.Height;
 223
 224                         if (container.MaximumSize.Width != 0 && width > container.MaximumSize.Width)
 225                                 width = container.MaximumSize.Width;
 226
 227                         if (container.MaximumSize.Height != 0 && height > container.MaximumSize.Height)
 228                                 height = container.MaximumSize.Height;
 229
 230                         container.SetBounds (left, top, width, height, BoundsSpecified.None);
 231                 }
 232 #endif
 233
 234                 public override bool Layout (object container, LayoutEventArgs args)
 235                 {
 236                         Control parent = container as Control;
 237
 238                         Control[] controls = parent.Controls.GetAllControls ();
 239
 240                         LayoutDockedChildren (parent, controls);
 241                         LayoutAnchoredChildren (parent, controls);
 242 #if NET_2_0
 243                         LayoutAutoSizedChildren (parent, controls);
 244                         if (parent is Form) LayoutAutoSizeContainer (parent);
 245 #endif
 246
 247                         return false;
 248                 }
 249
 250 #if NET_2_0
 251                 private Size GetPreferredControlSize (Control child)
 252                 {
 253                         int width;
 254                         int height;
 255                         Size preferredsize = child.PreferredSize;
 256
 257                         if (child.GetAutoSizeMode () == AutoSizeMode.GrowAndShrink) {
 258                                 width = preferredsize.Width;
 259                                 height = preferredsize.Height;
 260                         } else {
 261                                 width = child.ExplicitBounds.Width;
 262                                 height = child.ExplicitBounds.Height;
 263                                 if (preferredsize.Width > width)
 264                                         width = preferredsize.Width;
 265                                 if (preferredsize.Height > height)
 266                                         height = preferredsize.Height;
 267                         }
 268
 269                         // Sanity
 270                         if (width < child.MinimumSize.Width)
 271                                 width = child.MinimumSize.Width;
 272
 273                         if (height < child.MinimumSize.Height)
 274                                 height = child.MinimumSize.Height;
 275
 276                         if (child.MaximumSize.Width != 0 && width > child.MaximumSize.Width)
 277                                 width = child.MaximumSize.Width;
 278
 279                         if (child.MaximumSize.Height != 0 && height > child.MaximumSize.Height)
 280                                 height = child.MaximumSize.Height;
 281
 282                         return new Size (width, height);
 283                 }
 284 #endif
 285         }
 286 }